/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: andry_g_r https://cdn.slidesharecdn.com/profile-photo-andry_g_r-48x48.jpg?cb=1523106597 "Never increase, beyond what is necessary, the number of entities required to explain anything." William of Ockham (1285-1349)